Morb

Morbs are non-hostile, land-based critters that can be found naturally in the Caustic Biome. If an Outhouse is filled and left unemptied, a Morb will spawn near it. While they cannot be tamed, they can be captured with a Critter Trap and delivered to a Critter Drop-Off. They passively excrete Polluted Oxygen and consume nothing.

Mechanics

 * Periodically, they will emit a cloud with 200g of Polluted Oxygen if their current tile meets certain conditions:
 * Not in Vacuum or occupied by Liquids
 * Pressure below 1000g
 * Arrived at this tile on its last movement
 * If the second tile above them is not blocked, Morbs will show an "emission" animation at this point. It is not required.
 * Morbs can be used to farm Polluted Oxygen.
 * A "stable" of at least 5 tiles wide and 1 tall is needed for maximum production. They will produce less Polluted Oxygen without enough space.
 * Morbs cannot be overcrowded or unhappy, so you can put a large number of them in a small room and it will not impact their production rate.
 * Gases heavier than Polluted Oxygen will displace the emission clouds, allowing you to maintain a steady atmospheric pressure for your Morbs even in rooms above 1000g.
 * Placing Vents with a low rate of output (e.g. 5 g/s Carbon Dioxide) behind the Morbs can provide a similar protection from Vacuum penalties if you have Gas Pumps harvesting the emission clouds.
 * Combining Morbs' production of Polluted Oxygen with Pufts' conversion of Polluted Oxygen into Slime can enable the renewable production of Algae by using an Algae Distiller or Coal via Hatches.
 * Morbs produce Slimelung germs.
 * Morbs can be intentionally spawned by reloading the game or by disabling and enabling the Outhouse, making refilling it unnecessary.

Production Rates
Due to the unique behavior of Morbs and infrequency of their emission clouds, measuring their output consistently has been challenging for players. Past experimenters have reported:


 * In 2018, production rates of up to ~11 g/s Polluted Oxygen (6.7 kg/cycle) per Morb using a flat "stable" with 1 tile height and 7 tiles wide. At this point, Morbs could also produce unlimited pressure if submerged in a small amount of liquid.
 * In July 2019, production of < 1 g/s Polluted Oxygen (< 0.6 kg/cycle) per Morb when placing 200 Morbs into a 12 x 12 square "stable". This may have been due to Vacuum preventing them from emitting clouds, a recent change in the Launch Update.
 * In September 2019, production rates of ~15 g/s Polluted Oxygen (~9 kg/cycle) per Morb using a flat "stable" with Carbon Dioxide vents to maintain appropriate gas pressure across 7 tiles width.

This suggests that the ideal pairing for Pufts and Deodorizers is around 7 Morbs each, and just 2 Morbs each for Puft Princes.

Behavior
Morbs are not hostile and will try to flee when attacked. They will wander in one direction until they cannot travel further, then turn and travel back, they have the ability to jump walls that are 2 tiles high, or across a tile gap. Like other critters, they may be trapped permanently inside of doors and Mesh Tiles.

Morbs, like Pufts, only achieve their maximum production rate if their mobility is limited and if never over-pressured. They will otherwise spend much of their time traveling or idling instead of producing.

Морб